arch/arm/mach-omap2/display.c

   1 /*
   2  * OMAP2plus display device setup / initialization.
   3  *
   4  * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
   5  *      Senthilvadivu Guruswamy
   6  *      Sumit Semwal
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  13  * kind, whether express or implied; without even the implied warranty
  14  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include <linux/string.h>
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/io.h>
  23 #include <linux/clk.h>
  24 #include <linux/err.h>
  25 #include <linux/delay.h>
  26
  27 #include <video/omapdss.h>
  28 #include <plat/omap_hwmod.h>
  29 #include <plat/omap_device.h>
  30 #include <plat/omap-pm.h>
  31 #include "common.h"
  32
  33 #include "mux.h"
  34 #include "control.h"
  35 #include "display.h"
  36
  37 #define DISPC_CONTROL           0x0040
  38 #define DISPC_CONTROL2          0x0238
  39 #define DISPC_IRQSTATUS         0x0018
  40
  41 #define DSS_SYSCONFIG           0x10
  42 #define DSS_SYSSTATUS           0x14
  43 #define DSS_CONTROL             0x40
  44 #define DSS_SDI_CONTROL         0x44
  45 #define DSS_PLL_CONTROL         0x48
  46
  47 #define LCD_EN_MASK             (0x1 << 0)
  48 #define DIGIT_EN_MASK           (0x1 << 1)
  49
  50 #define FRAMEDONE_IRQ_SHIFT     0
  51 #define EVSYNC_EVEN_IRQ_SHIFT   2
  52 #define EVSYNC_ODD_IRQ_SHIFT    3
  53 #define FRAMEDONE2_IRQ_SHIFT    22
  54 #define FRAMEDONETV_IRQ_SHIFT   24
  55
  56 /*
  57  * FRAMEDONE_IRQ_TIMEOUT: how long (in milliseconds) to wait during DISPC
  58  *     reset before deciding that something has gone wrong
  59  */
  60 #define FRAMEDONE_IRQ_TIMEOUT           100
  61
  62 static struct platform_device omap_display_device = {
  63         .name          = "omapdss",
  64         .id            = -1,
  65         .dev            = {
  66                 .platform_data = NULL,
  67         },
  68 };
  69
  70 struct omap_dss_hwmod_data {
  71         const char *oh_name;
  72         const char *dev_name;
  73         const int id;
  74 };
  75
  76 static const struct omap_dss_hwmod_data omap2_dss_hwmod_data[] __initdata = {
  77         { "dss_core", "omapdss_dss", -1 },
  78         { "dss_dispc", "omapdss_dispc", -1 },
  79         { "dss_rfbi", "omapdss_rfbi", -1 },
  80         { "dss_venc", "omapdss_venc", -1 },
  81 };
  82
  83 static const struct omap_dss_hwmod_data omap3_dss_hwmod_data[] __initdata = {
  84         { "dss_core", "omapdss_dss", -1 },
  85         { "dss_dispc", "omapdss_dispc", -1 },
  86         { "dss_rfbi", "omapdss_rfbi", -1 },
  87         { "dss_venc", "omapdss_venc", -1 },
  88         { "dss_dsi1", "omapdss_dsi", 0 },
  89 };
  90
  91 static const struct omap_dss_hwmod_data omap4_dss_hwmod_data[] __initdata = {
  92         { "dss_core", "omapdss_dss", -1 },
  93         { "dss_dispc", "omapdss_dispc", -1 },
  94         { "dss_rfbi", "omapdss_rfbi", -1 },
  95         { "dss_venc", "omapdss_venc", -1 },
  96         { "dss_dsi1", "omapdss_dsi", 0 },
  97         { "dss_dsi2", "omapdss_dsi", 1 },
  98         { "dss_hdmi", "omapdss_hdmi", -1 },
  99 };
 100
 101 static void omap4_hdmi_mux_pads(enum omap_hdmi_flags flags)
 102 {
 103         u32 reg;
 104         u16 control_i2c_1;
 105
 106         omap_mux_init_signal("hdmi_cec",
 107                         OMAP_PIN_INPUT_PULLUP);
 108         omap_mux_init_signal("hdmi_ddc_scl",
 109                         OMAP_PIN_INPUT_PULLUP);
 110         omap_mux_init_signal("hdmi_ddc_sda",
 111                         OMAP_PIN_INPUT_PULLUP);
 112
 113         /*
 114          * CONTROL_I2C_1: HDMI_DDC_SDA_PULLUPRESX (bit 28) and
 115          * HDMI_DDC_SCL_PULLUPRESX (bit 24) are set to disable
 116          * internal pull up resistor.
 117          */
 118         if (flags & OMAP_HDMI_SDA_SCL_EXTERNAL_PULLUP) {
 119                 control_i2c_1 = OMAP4_CTRL_MODULE_PAD_CORE_CONTROL_I2C_1;
 120                 reg = omap4_ctrl_pad_readl(control_i2c_1);
 121                 reg |= (OMAP4_HDMI_DDC_SDA_PULLUPRESX_MASK |
 122                         OMAP4_HDMI_DDC_SCL_PULLUPRESX_MASK);
 123                         omap4_ctrl_pad_writel(reg, control_i2c_1);
 124         }
 125 }
 126
 127 static int omap4_dsi_mux_pads(int dsi_id, unsigned lanes)
 128 {
 129         u32 enable_mask, enable_shift;
 130         u32 pipd_mask, pipd_shift;
 131         u32 reg;
 132
 133         if (dsi_id == 0) {
 134                 enable_mask = OMAP4_DSI1_LANEENABLE_MASK;
 135                 enable_shift = OMAP4_DSI1_LANEENABLE_SHIFT;
 136                 pipd_mask = OMAP4_DSI1_PIPD_MASK;
 137                 pipd_shift = OMAP4_DSI1_PIPD_SHIFT;
 138         } else if (dsi_id == 1) {
 139                 enable_mask = OMAP4_DSI2_LANEENABLE_MASK;
 140                 enable_shift = OMAP4_DSI2_LANEENABLE_SHIFT;
 141                 pipd_mask = OMAP4_DSI2_PIPD_MASK;
 142                 pipd_shift = OMAP4_DSI2_PIPD_SHIFT;
 143         } else {
 144                 return -ENODEV;
 145         }
 146
 147         reg = omap4_ctrl_pad_readl(OMAP4_CTRL_MODULE_PAD_CORE_CONTROL_DSIPHY);
 148
 149         reg &= ~enable_mask;
 150         reg &= ~pipd_mask;
 151
 152         reg |= (lanes << enable_shift) & enable_mask;
 153         reg |= (lanes << pipd_shift) & pipd_mask;
 154
 155         omap4_ctrl_pad_writel(reg, OMAP4_CTRL_MODULE_PAD_CORE_CONTROL_DSIPHY);
 156
 157         return 0;
 158 }
 159
 160 int omap_hdmi_init(enum omap_hdmi_flags flags)
 161 {
 162         if (cpu_is_omap44xx())
 163                 omap4_hdmi_mux_pads(flags);
 164
 165         return 0;
 166 }
 167
 168 static int omap_dsi_enable_pads(int dsi_id, unsigned lane_mask)
 169 {
 170         if (cpu_is_omap44xx())
 171                 return omap4_dsi_mux_pads(dsi_id, lane_mask);
 172
 173         return 0;
 174 }
 175
 176 static void omap_dsi_disable_pads(int dsi_id, unsigned lane_mask)
 177 {
 178         if (cpu_is_omap44xx())
 179                 omap4_dsi_mux_pads(dsi_id, 0);
 180 }
 181
 182 int __init omap_display_init(struct omap_dss_board_info *board_data)
 183 {
 184         int r = 0;
 185         struct omap_hwmod *oh;
 186         struct platform_device *pdev;
 187         int i, oh_count;
 188         struct omap_display_platform_data pdata;
 189         const struct omap_dss_hwmod_data *curr_dss_hwmod;
 190
 191         memset(&pdata, 0, sizeof(pdata));
 192
 193         if (cpu_is_omap24xx()) {
 194                 curr_dss_hwmod = omap2_dss_hwmod_data;
 195                 oh_count = ARRAY_SIZE(omap2_dss_hwmod_data);
 196         } else if (cpu_is_omap34xx()) {
 197                 curr_dss_hwmod = omap3_dss_hwmod_data;
 198                 oh_count = ARRAY_SIZE(omap3_dss_hwmod_data);
 199         } else {
 200                 curr_dss_hwmod = omap4_dss_hwmod_data;
 201                 oh_count = ARRAY_SIZE(omap4_dss_hwmod_data);
 202         }
 203
 204         if (board_data->dsi_enable_pads == NULL)
 205                 board_data->dsi_enable_pads = omap_dsi_enable_pads;
 206         if (board_data->dsi_disable_pads == NULL)
 207                 board_data->dsi_disable_pads = omap_dsi_disable_pads;
 208
 209         pdata.board_data = board_data;
 210         pdata.board_data->get_context_loss_count =
 211                 omap_pm_get_dev_context_loss_count;
 212
 213         for (i = 0; i < oh_count; i++) {
 214                 oh = omap_hwmod_lookup(curr_dss_hwmod[i].oh_name);
 215                 if (!oh) {
 216                         pr_err("Could not look up %s\n",
 217                                 curr_dss_hwmod[i].oh_name);
 218                         return -ENODEV;
 219                 }
 220
 221                 pdev = omap_device_build(curr_dss_hwmod[i].dev_name,
 222                                 curr_dss_hwmod[i].id, oh, &pdata,
 223                                 sizeof(struct omap_display_platform_data),
 224                                 NULL, 0, 0);
 225
 226                 if (WARN((IS_ERR(pdev)), "Could not build omap_device for %s\n",
 227                                 curr_dss_hwmod[i].oh_name))
 228                         return -ENODEV;
 229         }
 230         omap_display_device.dev.platform_data = board_data;
 231
 232         r = platform_device_register(&omap_display_device);
 233         if (r < 0)
 234                 printk(KERN_ERR "Unable to register OMAP-Display device\n");
 235
 236         return r;
 237 }
 238
 239 static void dispc_disable_outputs(void)
 240 {
 241         u32 v, irq_mask = 0;
 242         bool lcd_en, digit_en, lcd2_en = false;
 243         int i;
 244         struct omap_dss_dispc_dev_attr *da;
 245         struct omap_hwmod *oh;
 246
 247         oh = omap_hwmod_lookup("dss_dispc");
 248         if (!oh) {
 249                 WARN(1, "display: could not disable outputs during reset - could not find dss_dispc hwmod\n");
 250                 return;
 251         }
 252
 253         if (!oh->dev_attr) {
 254                 pr_err("display: could not disable outputs during reset due to missing dev_attr\n");
 255                 return;
 256         }
 257
 258         da = (struct omap_dss_dispc_dev_attr *)oh->dev_attr;
 259
 260         /* store value of LCDENABLE and DIGITENABLE bits */
 261         v = omap_hwmod_read(oh, DISPC_CONTROL);
 262         lcd_en = v & LCD_EN_MASK;
 263         digit_en = v & DIGIT_EN_MASK;
 264
 265         /* store value of LCDENABLE for LCD2 */
 266         if (da->manager_count > 2) {
 267                 v = omap_hwmod_read(oh, DISPC_CONTROL2);
 268                 lcd2_en = v & LCD_EN_MASK;
 269         }
 270
 271         if (!(lcd_en | digit_en | lcd2_en))
 272                 return; /* no managers currently enabled */
 273
 274         /*
 275          * If any manager was enabled, we need to disable it before
 276          * DSS clocks are disabled or DISPC module is reset
 277          */
 278         if (lcd_en)
 279                 irq_mask |= 1 << FRAMEDONE_IRQ_SHIFT;
 280
 281         if (digit_en) {
 282                 if (da->has_framedonetv_irq) {
 283                         irq_mask |= 1 << FRAMEDONETV_IRQ_SHIFT;
 284                 } else {
 285                         irq_mask |= 1 << EVSYNC_EVEN_IRQ_SHIFT |
 286                                 1 << EVSYNC_ODD_IRQ_SHIFT;
 287                 }
 288         }
 289
 290         if (lcd2_en)
 291                 irq_mask |= 1 << FRAMEDONE2_IRQ_SHIFT;
 292
 293         /*
 294          * clear any previous FRAMEDONE, FRAMEDONETV,
 295          * EVSYNC_EVEN/ODD or FRAMEDONE2 interrupts
 296          */
 297         omap_hwmod_write(irq_mask, oh, DISPC_IRQSTATUS);
 298
 299         /* disable LCD and TV managers */
 300         v = omap_hwmod_read(oh, DISPC_CONTROL);
 301         v &= ~(LCD_EN_MASK | DIGIT_EN_MASK);
 302         omap_hwmod_write(v, oh, DISPC_CONTROL);
 303
 304         /* disable LCD2 manager */
 305         if (da->manager_count > 2) {
 306                 v = omap_hwmod_read(oh, DISPC_CONTROL2);
 307                 v &= ~LCD_EN_MASK;
 308                 omap_hwmod_write(v, oh, DISPC_CONTROL2);
 309         }
 310
 311         i = 0;
 312         while ((omap_hwmod_read(oh, DISPC_IRQSTATUS) & irq_mask) !=
 313                irq_mask) {
 314                 i++;
 315                 if (i > FRAMEDONE_IRQ_TIMEOUT) {
 316                         pr_err("didn't get FRAMEDONE1/2 or TV interrupt\n");
 317                         break;
 318                 }
 319                 mdelay(1);
 320         }
 321 }
 322
 323 #define MAX_MODULE_SOFTRESET_WAIT       10000
 324 int omap_dss_reset(struct omap_hwmod *oh)
 325 {
 326         struct omap_hwmod_opt_clk *oc;
 327         int c = 0;
 328         int i, r;
 329
 330         if (!(oh->class->sysc->sysc_flags & SYSS_HAS_RESET_STATUS)) {
 331                 pr_err("dss_core: hwmod data doesn't contain reset data\n");
 332                 return -EINVAL;
 333         }
 334
 335         for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
 336                 if (oc->_clk)
 337                         clk_enable(oc->_clk);
 338
 339         dispc_disable_outputs();
 340
 341         /* clear SDI registers */
 342         if (cpu_is_omap3430()) {
 343                 omap_hwmod_write(0x0, oh, DSS_SDI_CONTROL);
 344                 omap_hwmod_write(0x0, oh, DSS_PLL_CONTROL);
 345         }
 346
 347         /*
 348          * clear DSS_CONTROL register to switch DSS clock sources to
 349          * PRCM clock, if any
 350          */
 351         omap_hwmod_write(0x0, oh, DSS_CONTROL);
 352
 353         omap_test_timeout((omap_hwmod_read(oh, oh->class->sysc->syss_offs)
 354                                 & SYSS_RESETDONE_MASK),
 355                         MAX_MODULE_SOFTRESET_WAIT, c);
 356
 357         if (c == MAX_MODULE_SOFTRESET_WAIT)
 358                 pr_warning("dss_core: waiting for reset to finish failed\n");
 359         else
 360                 pr_debug("dss_core: softreset done\n");
 361
 362         for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
 363                 if (oc->_clk)
 364                         clk_disable(oc->_clk);
 365
 366         r = (c == MAX_MODULE_SOFTRESET_WAIT) ? -ETIMEDOUT : 0;
 367
 368         return r;
 369 }